2013 Kentucky GIS Pre-Conference Workshop
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Transcript of 2013 Kentucky GIS Pre-Conference Workshop
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2013 Kentucky GIS Pre-Conference Workshop
GPS Technology: Survey vs. Mapping
Mr. Jeff Clark, PLS -- Precision Products Geospatial Division
Mr. Eric Muncy – Precision Products Geospatial Division
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Sputnik
Launched in 1957
First man made satellite
Transmitted radio signals
Lived for about 3 months
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US Military
First used in the 1960s
To track nuclear power vehicles - ships
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Korean Flight 007
Shot down September 1983
Accidently was in Russian Air Space
Presidential Order was signed to make GPS available for civilian use
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Selective Availability (SA)
1989 – Intentional dithering of the satellite clocks by the DOD called SA was instituted in 1989.
2000 – President Clinton ordered SA to switched off on May 2, 2000.
Had little to no effect on surveying applications of GPS
Greatly improved consumer grade GPS
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BASE STATION
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Different Grades of GPS?
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Consumer or Recreational grade…Consumer Grade
Inexpensive
15 to 30 feet accuracy
Good for general locations Navigation Street Signs Trees Buildings (911)
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Mapping Grade…Mapping/GIS Grade
1 inch to 10 feet accuracy
Digital Clipboard
Good for more accurate locations Hydrants Manholes Roads
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Survey Grade Centimeters accurate
Most robust
Good for the accurate locations related to: Control networks Land boundaries Topographic & Engineering
Surveys
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What is the freaking difference??
Survey vs. Mapping
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Collection of Attributes/Photos Taking GIS data out with you
Mapping - Software
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Stakeout operations Volumetric calculations Coordinate Geometry Metadata - Datums, NAD 83, Geoids
Survey - Software
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• VRS – Virtual Reference Station
• Free Service (Anyone to use)
• Can be used in real time (Cell phone / Cell modem) or back in the office to process GPS data
• Continuing to be improved (location and accuracy)
• http://kycors.ky.gov/
KYTC VRS - Basics
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KYTC VRS – Basics
THEN
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KYTC VRS – Basics
NOW
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Questions?
Contact Info:
Mr. Jeff Clark, PLS Cell: 270-559-9097 Email: [email protected]
Mr. Eric Muncy Cell: 859-321-3675 Email: [email protected]